| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 33°F | 26°F | 1.4" |
| February | 20°F | 35°F | 27°F | 2.3" |
| March | 31°F | 49°F | 39°F | 4.2" |
| April | 40°F | 62°F | 50°F | 5.9" |
| May | 51°F | 72°F | 61°F | 7.2" |
| June | 60°F | 81°F | 70°F | 5.5" |
| July | 63°F | 83°F | 73°F | 5.5" |
| August | 61°F | 81°F | 71°F | 3.1" |
| September | 55°F | 75°F | 64°F | 4.0" |
| October | 44°F | 63°F | 53°F | 0.3" |
| November | 34°F | 50°F | 41°F | 6.5" |
| December | 25°F | 37°F | 31°F | 2.8" |
| Index | Bourbon | Indiana | National |
| Air quality index | 42 | 56 | 42 |
| Pollution index | 4,313,200 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 275 |
| Days with moderate air quality | 90 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.130% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Milford, IN | 1,664 | 37 | 26.0% |
| Claypool, IN | 529 | 37 | 26.0% |
| Etna Green, IN | 565 | 37 | 26.0% |
| Nappanee, IN | 7,138 | 37 | 26.0% |
| Leesburg, IN | 774 | 37 | 26.0% |
| Bourbon, IN | 1,942 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Midland City, AL | 1,942 | 35 | 30.0% |
| Robesonia, PA | 1,942 | 42 | 16.0% |
| Coal City, WV | 1,942 | 295 | 490.0% |
| Slocomb, AL | 1,941 | 35 | 30.0% |
| Crystal Lawns, IL | 1,943 | 55 | 10.0% |
| Bourbon, IN | 1,942 | 42 | 16.0% |
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